Patent GB-1124647-A (GB)
Title: Apparatus for molding fluid seal elements
Inventor: BANEY GEORGE JUNIOR
IPC: B29C33/00
Filed: 1965-12-03
Abstract: 1,124,647. Sealing elements. DANA CORP. 3 Dec., 1965 [5 March, 1965], No. 51481/65. Heading B5A. Sealing elements are moulded and bonded to a metal shell having an outer cylindrical wall and an annular wall projecting inwardly from one end of the cylindrical wall in apparatus comprising a lower mould part 15, having a cavitydefining surface shaped to form the outer surface of the sealing element, yieldingly supported by means including springs 14, and having a pressure land 22 to engage and support the annular wall of said metal shell 27; means to engage and centre said shell on the lower mould part 15, an upper mould part 31 also having a cavity-defining surface, shaped to form the inner surafce of the sealing element, and having an upwardly-facing shoulder 38 normally maintained in engagement by spring means 39 with a downwardly-facing shoulder 37 of a clamping ring 36 which encircles the upper mould half, and which has a pressure land to engage the annular wall of the shell 27, and clamp it on to the pressure land of the lower mould part 22. The upper mould part also has a pressure land 35 to engage the lower mould part and close off a cavity between them, and push it downwards against its spring 14, the clamping ring being moved upwardly relative to the upper mould part against its springs 39, there also being inter-engageable means to axially align the two mould parts. The lower mould part preferably has an outer diameter less than the diameter of the inner face of the outer cylindrical wall 26 of the metal shell and may be supported by the springs 14 on a lower mounting plate 10 e.g. in a cylindrical opening in a positioning plate 11 fixed on the lower mounting plate 10 and into which it may telescope, the mould part being fixed to the mounting plate by a screw 18 and limited in movement by the screw-head 19. The pressure land on the lower mould part 22 may be a narrow annular rib upstanding therefrom, also serving to close off the mould cavity and may also serve as the said centering means if the metal shell has an inner cylindrical wall 47 engaged by the inner surface of the rib 22. The centering means may alternatively be a centering ring (68, Figs. 5, 6, not shown) carried on a stripper plate (48<SP>1</SP>) which encircles the lower mould part, the ring engaging the outer cylindrical wall of the shell. The stripper (48<SP>1</SP>) is activated by means passing up through passage (49). The aligning means may comprise a cylindrical boss 33 on the upper mould part, movable into a cylindrical counterbore 20 in the lower mould part. The moulding material 24A may be placed on an annular wall extending inwardly from the cavity-defining surface of the lower mould part, and the pressure land 35 pinches off material therefrom to close the cavity. The mould when closed preferably contains a dump 34, Fig. 2 in which pinched-off waste material is retained. Fig. 4 (not shown), shows a two-section upper mould half (31A and 31B) defining a cavity shaped to form a two-lip sealing element Figs. 7, 8 (not shown) show alternative sealing elements bonded to metal shells (75, 76).